Exhaust muffler for motor cars



Jan. 1

F. J. HERDLE EXHAUST MUFFLER FOR MOTOR CARS Filed Nov. 21, 1921 INVENTOHfjfierd/a ATTORNEYS Patented Jan. 1, 1924.

UNITED STATES FREDERICK J. HERDLE, OF CHICAGO, ILLINOIS.

EXHAUST MUFFLER FOR MOTOR CARS.

Application filed November 21, 1921. Serial No. 516,693.

To all whom it may concern):

Be it known that I, Fnnomrox J. Human, a citizen of the United States,and a resident of Chicago, in the county of Cook and State of Illino1s,have invented a new and useful Improvement in Exhaust Mufilers for MotorCars, of which the following is a full, clear, and exact description. I

My-invention relates to improvements in exhaust mufllers for motor cars,and it consists in the combinations, constructions, and arrangementsherein described and claimed.

An object of my invention is to provide a mufiler which has means forreducing the back pressure upon exhaust gases passing therethrough.

A further object of my invention isto provide a device of the t pedescribed which has means therein for e ectually baflling the exhaustgases.

A further object of my invention is to provide a device of the characterdescribed which has automatic means for instantly expelling the exhaustgases when the pressure therein has exceededa predetermined pressure.

Ar further object of my invention is to provide a device of thecharacter described which is simple in construction, easy to assemble,and which is not likely to easily get out of order.

Other objects and advantages will appear in the following specification,and the novel features of the invention will be particularly pointed outin the a pended claims.

My invention is i lustrated in the accom panying drawings, forming partof this application, in which- Figure 1 is a longitudinalsection-through the device,

Fi re 2 is a section along the line 22 of Figure 1,

Figure 3 is a section along the line 33 of Figure 1, and

Figure 4-. is a section along the line 4-4 of Flgure 1.

In carrying out 111 invention, I provide an outer cylinder 1 w ich isslightly conical in shape. An end plate 2 is provided wlth an annularflange 3 over which the smaller end of the cylinder 1 is disposed. Theend 2 is also rov'ided with an annular flange 4 which is isposed insideof the flange 3 and is concentric therewith. A conical-shaped cylinder 5is disposed in the cyllnder 1 and around the flange 4. This cylinder hasits larger opening disposed adjacent the end 2. It will thus be seenthat I provide a space between the cylinder 1 and the cylinder 2 whichis tapered from the end 2. The two cylinders 1 and 5 are substantiallyof the same length. A ring 6 is disposed at the opposite end of thecylinder 1 and has an annular flange 7 which is disposed in thecylinder 1. As clearly shown in Figure 2, the ring 6 is also rovidedwith three inwardly projecting ugs 8. These lugs are provided withcurved recesses at the inner ends thereof. The cylinder 5 is providedwith an end plate 9 which has an annular flange 10 that projects intothe open end of the cylinder. he end 9 has three outwardly extendinglugs 11 which are adapted to be alined with the lugs 8 of the ring 6 andto overlie the same. The lugs 11 have openings therein in which bolts 12are disposed. These bolts are substantially as lon as the c linders 1and 2 and are dispose in the a ined openings of the ring 6 and the endplate 2, whereby these two members are rigidly secured to the cylinders1 and 2. I show three of these bolts, although any number so desired maybe used. A curved pipe 13 is secured to the ring 6 by means of bolts 14.The end 2 has a spherical-shaped. dome 15 integral therewith, the domebeing provided with a threaded opening 16 therem. The end plate 2 cantherefore be secured to an exhaust pipe 17 by merely screwing the endplate 2 onto the pipe 17 The cylinder 1 has a plurality of openings 18therein which are disposed adjacent to the plate 2. A funnelshapedmember 19, secured to the cylinder 1 by means of rivets 20, is sodisposed on the cylinder 1 that the openings 18 are adjacent to theinner side thereof. A bafile plate 21 of the shape shown in Figure 1, issecured to the flange 4 by means of screws 22. It will be observed thatthe bafile plate has openings 23 through which the exhaust gases fromthe pipe 17 are permitted to pass. The cylinder 1 has a plurality ofopenings 24 therein which are disposed adjacent the ring 6. As shown inFigure 1, the wall of the cylinder 5 is bent outwardly adjacent each ofthe openings so as to permit the exhaust gases in the cylinder toreadilypass through the openings 24. The plate 9 has a central opening 25therein which is substantially the same size as the opening 16. Aweighted door 26 is hingedly secured to the plate 9 and is adaptedto'covcr the opening 25 and to swing away therefrom when the pressure ofthe exhaust gases in the cylinder 5 exceeds a predetermined pressure. Anasbestos pad is carried by the door and tends to deaden the sound whenthe door swings back to normally closed position. The door 26 is alsoprovided with a threaded rod 27 on which a Weighted nut 28 is disposed.It will be seen that a rotation of the nut 28 in either direction willcause a greater or less pressure of the exhaust gases, as the case maybe, in the cylinder to open the door 26. A baffle screen 29 is disposedin the cylinder 1 and extends substantially the entire length thereof.As shown in Figure 3, the screen 29 is corrugated and is rolled upbefore being inserted into the cylinder 1. One end of the screen 29 ismade of a fine mesh and the opposite end thereof is made of a coarsemesh. When rolling the screen, the coarse mesh is disposed in the middleof the roll. This construction permits the exhaust gases to readily passthrough the first few rings of the screen, since the rings are composedof coarse mesh, but hinders the gases from rapidly passing on throughthe outer rings of the screen, since these rings are composed of a finermesh.

From the foregoing description of the va rious parts of the device, theoperation thereof may be readily understood. It will clearly be seenthat as the gases from the pipe 17 pass into the cylinder 5, they willbe diverted from their course by the baffle plate 21. The gases thenpass on through the screen 29 and out through the openings 24 into thecylinder 1. As heretofore stated, the gases are effectually baflled,since the mesh of the screen29 varies from coarse to fine. It will alsobe observed that the member 19 directs a column of air through theopenings 18 and into the space between the cylinders 1 and 5. This airpasses on through the spaces between the lugs 11 and out of the pipe 13.

The rush of the air between the cylinders 1 and 5 reduces the backpressure that is prevalent in mufliers of ordinary construction. It isobvious that the exhaust gases which are expelled from the cylinder 5into the space between the cylinders 1 and 5 are carried out through theopening of the pipe 13. It will also be observed that the opening 30 ofthe pipe 1.3 is larger than the opening 16 of the plate 2 and thereforepermits the exwould put the muflier out of commission, whereas in mydevice the exploded gases would force the door 26 open and would passthrough the opening 25 and out through the opening 30. As heretoforestated, the Weight of the door 26 can be varied by means of the nut 28so that the door will normally keep the opening 25 closed when theordinary amount of the exhaust gases are passing through the muffler.

The muffler can be readily disassembled by merely unloosening the bolts14 and removing the pipe 13 and then unloosening the nuts on the bolts12 and removing the cylinders 1 and 5 from the plate 2. As will be seenin Figure 2, the bolts 12 are received in the recesses of the lugs 8 andthereby prevent the ring 6 and the pipe 13 from rotating with respect tothe cylinders 1 and 5. As heretofore stated, the device consists of aminimum of parts, is effective forthe-pu'rpose intended, and will noteasily get out of order.

I claim:

1. A mufiler comprising an outer conicalshaped cylinder and an innerconical-shaped cylinder, the larger end of said inner cylinder beingdisposed adjacent to the smaller end of said outer cylinder, said outercylinder having openings adjacent to the smaller end thereof, afunnel-shaped member carried by said outer cylinder and disposedadjacent to the openings, said inner cylinder having openings adjacentto the smaller end thereof and having an exhaust inlet adjacent to thelarger end thereof, a rolled screen disposed in said inner cylinder, anda gravity door carried by said inner cylinder and communicating withsaid outer cylinder.

(l 2. A mulfier comprising an inner conicalshaped cylinder, an outerconical-shaped cylinder, a plate secured to the adjacent ends of bothcylinders, said plate having an exhaust inlet communicating with saidinner cylinder, a baflle plate disposed in said inner cylinder andsecured to said plate, a rolled screen disposed in said inner cylinder,and a gravity door carried by said inner cylinder and communicating withsaid outer cylinder.

3. A mufller comprising an inner conicalshaped cylinder, an outerconical-shaped cylinder, a late secured to the adjacent ends of bothcylinders, said plate having an exhaust inlet communicating with saidinner cylinder, a bafile plate disposed in said inner cylinder andsecured to said plate, and a rolled screen disposed in said innercylinder, said screen being corrugated and having a coarse mesh in theinner circles thereof, which gradually -decreases to a fine mesh in theouter circles thereof.

4. A mufiler comprising an inner casing, an outer casing, said innercasing having openings in the side wall thereof, a gravity actuated dooradapted to close one end of coarse mesh in the inner circles thereofwhich gradually decreases to a fine mesh in the outer circles thereofand a gravity actu- 1 ated door adapted to normally close one end ofsaid casing.

FREDERICK J. HERDLE.

